In Form2 on the click event of a Button whatever you use to "click a record" in that form
If CurrentProject.AllForms("Form1").IsLoaded Then
DoCmd.Close acForm, "Form1"
DoCmd.OpenForm "Form1", , , , , , "FilterForm1"
Else
DoCmd.OpenForm "Form1", , , , , , "FilterForm1"
End If
"FilterForm1"...